Spark-pi



C. ANDREASON.

SPARK PLUG.

immuno mtu ria. w. |919.

APatented Oct. 26, 1920.

INVENTOR iraez fueason vom ATToRNaYs upon a stem extending cylinder headA oNrri-:D ys'rii'rizs iwriazrrrn orrice.

CHRISTIAN ANDREASON, 0F SACRAMENTO, CALIFORNIA.

SPARK-PLUG.

APP

To aZZ whom it may concern.'

Be it known that I, CHRISTIAN ANnicnA- soN, a citizen of the United States, residing at Sacramento, in the county of' Sacramento and State of California, have invented new and useful Improvements in Spark- Plugs, of which the following is a specification.

This invention relates to a spark plug for internal combustion engines.

It is the principal ob3ect of this invention to provide a s ark plug which will aiford adequate sparking surface for insuring that the gases within'an internal combustion engine may be properly ignited and at the saine time will supply simple means by which the electrodes may be cleaned of carbon without removing the plug from its po*- sition within the cylinder head o'f the engine.

The present invention is particularly concerned with a spark plug having a fixed metallic casing carrying a ring-shaped electrode adapted to cooperate with a central electrode member to produce a spark, this central member being revolubly mounted Y upwardly through the center of the spar plug and scraping the surface of the ring-shaped electrode during its revolution.

The invention is illustrated hy way of example in the accompanying drawings, in which#- Figuio l is a view of the spark plug as seen in longitudinal vertical section.

Fig. 2 is an end view of the spark plug disclosing the relation of the electrodes to each other.

In the drawings, plug portion which is formed with a tubular threaded extension 1l adapted to be positionel within the threaded bore of an engine As a matter of convenience the body portion ol this plug is hexagonal in shape to facilitate the tightening or removal of the plug. An internally threaded tubular extension 12 is formed at the upper end of the plug and is adapted to receive a look-nut 13. rThis nut circuinsrrihes an in! sui-ated tulie 14 which extends downwardly through the central bore ol' the plug and lining lorined of divieti-ir. material desii'juhly supports a (zentral elettrodo sleeve l5. The insulator vt1 is toi-ined with an annular ring Specification of Letters. Patent.

10 indicates themetullic v Patented Oct. 26, 1920.

lisation filed February 19, 1919. Serial No. 278,029.

central electrode sleeve 15 is formed of metal iport for the cenaiid provides a guiding su he sleeve is extral electrode stem 18. teriorly threaded near its upper end and receives a wing-nut 19. A lorlenut 20 holds the sleeve in any desirable position` with relation to the electrode.

An opening is formed through the center of the wing-ruit 19 and the stem 18 extends therethrough. Mounted upon the upper end of this stein is a thumlrnut 21 by which the stein may be rotated. The upper end of the sleeve 15 is split and externally tapered and coi'iperates with the nut 19 to adjustably hold the stem. It will thus be seen that when the nut 19 is tightened, the stem will be rigidly held. The lower end of the electrode stem 18 is formed with a pair of arms 24. These arms extend radially from the longitudinal axis of the stem and stand in proper spaced relation to a Circular electrode 25. This electrode is fixed beneath the tubular portion 11 ot the plug 1() and serured theretoA Thus, by the application .of a current to the stem 18 and to the plug il), a spark may be Created between the electrode arms 24 und the electrode 25. may he adjustable, if desired, and thus regulate'tlie spark gap existing between the two electrodes.

As shown in Fig. t, the arms 24 are downwardly and outwardly tapered, thus producing a linife edge and a flat underfuce adapt ed to pass along the upper face of the electrode 25. Thus, when the nut Il) is loosened, the electrode arms 24 muy he lowered until they hear forcibly upon the circular elee trodt-` alter which the stein 18 may be rerolved hy manipulation ot' the thumb-nut 2lV und the carbon deposited upon the electrode thus removed. It will also be noted that this will produce :t scouring action lietweon the flat face of the electrode arms 24 and the upper flat face of the electrode Q5,

The collar 23 thus cleaningr the two surfaces and insuring that the proper spark Will be obtained. After this operation has been completed, the stem may be drawn outwardly, as desired, after whit-h the nut 19 may be tightened and the various elertrode members thus held in a rigid relation to each other.

It will thus be seen that the spark plug here disclosed is not` only simple in its construction and the manner in whioh it is assembled but will also provide :i duel spark gap and means whereby the contact points may be properly cleaned without removing the plug from its operative position.

lllhile l have shown the preferred form of my invention, it will be understood that various changes in the rombination, construction and arrangement of parte may be made by those skilled in tbe art, without departing from the spirit of the invention as Claimed.

Having thus described my invention, what I claim and desire to secure by Letters Patent is- A spark plug;r comprising a metallic body member, a rirenlar electrode mounted upon the lower end thereof, a tubular insulator letarlmbllv fixed within said body member, a metallic sleeve carried by said tubular member, an electrode stem extending through said sleeve, means for fixing said stem in relation thereto. means for looking the stem in relation to the insulating member, electrode arms formed at the lower end of said Stem and means whereby said stem and arms may be revolved to remove carbon deposits from the first named electrode.

In testimony whereof ll have hereunto set my hand in the presence ol two subscribing witnesses.

CHRISTIAN ANDREASON. llllitnosses S. lnAaLE TINsLnn, OLIVE M. SGU'JYI. 

